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GEORGE H. WARING ANDOSOAR B. WHITE, OF ST. JOHN, CANADA.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent 1\T o. 512,638, dated January 9, 1894.

Application and May 15.1893. serial Nb.4'14.s49. (No moda.)

V To a/ZZ whom it may concern:

Be it known that we, GEORGE H. WARING and OSCAR B. WHITE, of the city of St. John, 1n the county of St. John, in the Province of New Brunswick, in the Dominion of Canada, have invented certain new and useful Improvements in Steam-Engines, of which the following is a full, clear, and exact descripion.

Reference is made to the accompanying drawings in which- Figure 1 is a horizontal section of the device. Figs. 2, 3 and 4 are horizontal-part seeltions of the device in different positions.

Fig. 5 is a top View of the valve. side view of the valve. views of the valve. view of said valve.

The first part of our invention relates to the combination of two cylinders of different diameters having a common center and of equal length, connected to and openingfreely into each other and two pistons of different diameters having a common center and solidly connected, adapted to fit and reciprocate in the cylinders.

The second part of our invention relates to a valve and steam chest having openings which are controlled by the valve so as to admit steam to the small cylinder and from it to the large one and from the large cylinder to both cylinders between the two pistons.

The third part of our invention relates to an auxiliary valve, or by-pass which is used in starting the engine and when open allows live steam to both the small and large pistons so as to cause them to reciprocate in the cylinders.

Similarletters referto si milar parts throughout the several views.

A and B are small and large cylinders opening freely into each other and having equal lengths and a common center.

C and D are small and large pistons solidly connected as shown and adapted to fit and re ciprocate in the cylinders A and B respectively.

E is a hollow cylindrical valve adapted to reciprocate in its chamber and in conjunction with the passages, or ports a, b, c andadmit and control steam so that it will cause the pistons C and D to reciprocate. The stem of Fig. 6 is a Figs. 7 and 8 are end Fig. 9 is a cross sectional said valve is provided with pistons d, e, and f, as shown in the drawings.

F is a rotary auxiliary valve by which live steam may be admitted to either piston to cause them to reciprocate when starting.

Our device4 works as follows: Steam from the boiler enters at t', Fig. l, and passes through the steam chest between the pistons of the valve E and through the port ct to the cylinder A which causes the piston Oto move forward to the end of the stroke when the Valve E moves back, Fig. 2. and allows the steam in A to pass through l and Esphollow center to the port 1J and into the cylinder B. As the steam passes into A and B the piston D being larger than the piston O the pistons are forced backV toward the crank in the direction of the arrows. Steam is 'again admitted to the small cylinder A, Fig. l, which causes it to again move forward and the exhaust or dead steam in the cylinder B is forced out through the port b and through the hollow part of the valve E and through the port cinto the two cylinders A and B, but between the pistons and escapes from there ,through the exhaust port d. On the completion of this outward stroke, as in Fig. l, exhaust steam is again admitted to the large cylinder B in the manner hereinbefore described aud as illustrated in Fig. 2, which causes the inward stroke as before, in the direction of the arrows. rlhe engine is allowed to run high pressure this way, until up to speed and thoroughly warmed up when the auxiliary or starting valve F is closed as in Fig. 4 and then the live steam is admitted to the small cylinder A as before; but on the completion of the outward stroke the steam in A is cut oft from the boiler and by means of the valve E allowed to expand into the large cylinder B and the pressure being equal on the pistons C and D they move in toward the crank inthe direction of the arrows as in Fig. 2. The engine now runs by high pressure or live steam acting on O and this steam expanding into B and acting on D, which being larger than O while the pressure is the same on each, causes the inward or return stroke and so on throughout the entire run, the dead steam in the cylinder B exhausting as before described.

What we claim as new, and desire to secure by Letters Patent, is-

IOC

1. In a steam engine, the combination with two cylinders of different diameters and of common center and length, of two pistons of dierent diameters, solidly connected and adapted to fit and reciprocate in said cylinders, a port communicating with the smaller of said cylinders, an auxiliary valve controlling said port, a port communicating with the larger of said cylinders, a port located between the two pistons and communicating with both said cylinders, and a main valve having a hollow cylindrical portion, said main valve controlling all of said ports, substantially as described.

2. In a steam engine, the combination with two cylinders of different diameters and ot' common center and length, of two pistons of different diameters, solidly connected and GEORGE H. WARING. OSCAR B. WHITE.

Witnesses:

CHARLES F. SANFORD, ALEXANDER J. BARNHILL. 

